Multiple switch-board



(No Model.)

T. J. PERRIN. MULTIPLE SWITCH BOARD.

No. 315,333. Patented Apr. 7, 1885.

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UNITED STATES PATENT. OFFIC i THOMAS J. PERRIN, OF BROOKLYN, NEW YORK, ASSIGNOR TO CHARLES 1 HUNTINGTON, or GREENVILLE, u ssIssIrPI.

MULTIPLE SW'ITCH-BOARD.

SPECIFICATION forming part of Letters Patent No. 315,333, dated April 7, 1885. Application filed October 4, 1884. (No model.)

Be it known that I, THOMAS J. PERRIN, of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Multiple Switch- Boards for Telephone-Exchanges, of which the following is a specification.

The object of my invention is to produce a switch-board which will be simple in structure, veryeconomical to construct, and efficient in practical operation.

In an application for Letters Patent filed by me October 4:. 1884, and numbered 144,821,

I have shown the general arrangement of mainline circuits, local circuits, and plugs such as herein shown, and no claim is therefore made to such subject-matter. Reference is, how-- ever, made to that application for a further elaboration of the details of the instrument. In this application, however, I fully illustrate and describe all that is necessary to a complete understanding of the invention. Under my present invention the clearing-out annunoiators shown in that application are entirely dispensed with.

7 My invention, I desire to state, is not de pendent upon the particular structure herein. disclosed.

The accompanying drawing is a detail View, partly in section,of portions of two sections of a multiple switch-board.

Two corresponding main-line terminals are shown on each board, but only one line is connected up. All the other lines will be similarly connected and operated, and further illustration is therefore unnecessary.

At each main-line terminal shown in the drawing there is an electro-magnet, A, the

core of which A is shown as secured in the frame of the board. The main line is shown as connected directly with the core of the magnet at the board X, and also with the core of the magnet at the other terminal of the line on the board Y. The main line is also connected with a. contact-spring, B, which normally maintains contact with an adjustable stop, 0, mounted in a bracket, with which the operatorstelephone Dis connected. The end of the magnet-core A,projecting from the rear of the board,is preferably somewhat enlarged, as shown, and the contact-spring B is shown spring B is in contact with the stop 0, so that as drawn from the contactstop O, as is'described below. A local circuit, E, for this line includes the coils of the magnets A A, at the terminals of this line in the boards Xand Y. This local circuit is alsoprovided with contact-sections e f, set in the faces of the boards X Y at each of said terminals on opposite sides of the well or socket from which the front end of the magnet-core A projects. The plugs used to connect any subscriber calling with any other subscriber are clearly shown inthe drawing, and are preferably constructed as follows: The handle G ishollow and made of vulcanite or someother non-conducting material. Within it is a contact-pin. g, normally pressed forward by a spring, 9, i p which is electrically connected with a wire in the flexiblecord g". H The nose or plugging end of the plug is hollowedout,so as to permit the end of the magnet A to make contact with the pin 9, and is surrounded by a collar or contact-ring, h, for electrically connecting the contacts e f of the local circuit whenever a terminal is plugged to. i 7

All the lines which the operator at board X has special charge of, as is well understood, are connected with the telephoneD in the manner shown in the drawing.

The operation is as follows: Normally the there is direct connectionover the' mainline through the operators instrument D. The subscriber on this line may therefore call the operator and notify him that hedesires to communicate with a subscriber. The operator then calls the subscriber wanted and proceeds to connect the two. Upon the insertion of the plug G at the calling-subscribers' ter minal, as illustrated at X in the drawing, connection is established from the main line through the core A, pin 9, and-cord gito the other plug and subscribers line, into the terminal of which said plug is inserted. The same operation, however, completes the local circuit E at the contacts e. f, which completion of the circuit magnetizes the core of the magnets A A on both boards. The effect of this at board X is that the contact-spring B is attracted, as illustrated, away from the stop 0, thus cutting the operators instrument out of circuit, so that he is ready .to answer the forth, in a multiple switch-board, of the main line, its connections or terminals on the several boards, operator s instruments normally connected with the main line at its particular board, an electro-magnet at each of said connections or terminals, a local circuit, which includes the coils of said magnets, its contacts at each terminal, plugging or line-connecting devices which complete said local circuit whenever the terminal of said line is plugged to, and devices, actuated by the electro-magnet at the terminal of said line on its particular board, which disconnect the operator 5 instruments from the main line.

2. The combination, substantially as set forth, in a multiple switch-board, of a main line, its terminals or connections on the several boards, an electro-magnet at each of said terminals, a local circuit, which includes the coils of said magnet, contacts of said local circuit at each terminal, plugs and cords for connecting the subscribers, an armature for one of said magnets on one of the boards, and the main-line contacts,which are separated when. said armature is attracted, whereby when said local circuit is completed by plugging to the line terminal on any board the main line is broken at the separable contacts.

3. The combination, substantially as set forth, in a multiple switch-board, of the main line, its connections or terminals on the several boards, an electro-magnet at each of said terminals, a local circuit, which includes the coils of said magnets, the contacts of said local circuit at each terminal, plugs and cords for connecting the subscriber, and operators instruments normally directly connected with the line through the armature-spring B and contact 0.

In testimony whereof I have hereunto subscribed my name.

THOMAS J. PERRIN.

Witnesses:

JNo. B. JUDEN, JOHN JUDEN. 

